Jelly bag just copy the style of Hermes. Instead of leather, they are made of rubber. Around 1000 if from Italy or France. I have bought 2. But now I see a lot in Fa Yuen Street and other HK shops sold only around 200. I don't use it now because they are so many many .....
The one you saw around HKD 800 to 900 are from Italy. I bought two also. However, there are so many copy cats (i.e. Frankly speaking, I cannot call it as copy because Jelly bag is just a style not a brand). Anyway, the bags which sold around 200 to 400 are made in Hong Kong.